Guy with a gun sees the shooter dropping bystandters and starts shooting at him, shooter begins returning fire. Another guy, not in the theater but with a gun hears the shooting, rushes in, sees the guys shooting at each other, makes a guess as to which one is the bad guy and starts shooting at him. Kills the wrong guy. Meanwhile, the psychopath shooter turn on him and kills him. This brings a fourth guy guy who starts exchanging fire with the shooter and kills him, but now a fifth guy rushes in, and shoots the fourth guy thinking he’s the psychopathic gunman.